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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93559ffb518f7b546ed8f13a54619e177174d67ea2521021e692d5d5f377a0a6' 
  AND token = '/Hq7z0fwnaJxaQkntX1LRf7+LuZu4O/jrEFU6g8ngDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}